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Date: Thu, 09 Jul 2009 00:04:14 +0200
From: Simon Marechal <>
Subject: Re: Johns future - Question about OpenCL-interest and

RB a écrit :
> JtR already has an interface to manage various "accelerators" (i.e.
> machine-specific ASM), and I'm not convinced that wouldn't suffice for
> a hardware accelerator, "threading" implementation or not.

One of the point of having a hardware accelerator is that your CPU can 
do something else while your GPU/FPGA/whatever hashes. It is right now 
not trivial to do such a thing with JtR. It would however be great to be 
able to generate candidate passwords and perhaps prepare them, handle 
memory transferts on the CPU side, and just hash on the GPU side.

If you really want to do it using the current interface, you'll have 
your GPU waiting while the CPU is working, and the other way around. 
There is a way to hack something that would be much better, but it would 
require also hacking the self tests.

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